<%@ page import="java.util.List" %>
<%@ page import="java.util.ArrayList" %>
<%@ page import="java.sql.Connection" %>
<%@ page import="java.sql.Statement" %>
<%@ page import="java.sql.ResultSet" %>
<%@ page import="java.sql.DriverManager" %><%--
  Created by IntelliJ IDEA.
  User: 林云志
  Date: 2018/3/20
  Time: 15:45
  To change this template use File | Settings | File Templates.
--%>
<%@ page contentType="text/html;charset=UTF-8" language="java" %>
<html>
<head>
    <title>主页</title>
    <meta http-equiv="Content-Type" content="text/css" charset="UTF-8 ">
</head>
<body>
<h1>这是一个JSP文件</h1>

<%
    request.setCharacterEncoding("utf-8");
    //启动mysql win + r  services.msc
    out.write("hello,world!");


    out.write("<h1>hello,world!</h1>");

%>

<style type="text/css">
    table {
        border: 1px solid #000;
        border-collapse: collapse;
    }

    td, th {
        border: 1px solid #000;
        padding: 10px;
    }
</style>

<table>

    <%--<thead>--%>
    <%--<tr>--%>
        <%--<th>编号</th>--%>
        <%--<th>用户名</th>--%>
        <%--<th>密码</th>--%>
    <%--</tr>--%>
    <%--</thead>--%>

    <%--<tbody>--%>
    <%--<tr>--%>
        <%--<td>1</td>--%>
        <%--<td>Jhon</td>--%>
        <%--<td>123</td>--%>
    <%--</tr>--%>
    <%--<tr>--%>
        <%--<td>1</td>--%>
        <%--<td>Jhon</td>--%>
        <%--<td>123</td>--%>
    <%--</tr>--%>

    <%
        if ( session.getAttribute("isLogin")==null){

            //没有登录，跳转到login.jsp
            response.sendRedirect("login.jsp");

        }




        class User {
            int id;
            String name;
            String password;

            //alt + insert

            public User(int id, String name, String password) {
                this.id = id;
                this.name = name;
                this.password = password;
            }
        }
        User chen = new User(1, "chengongsuo", "123456");
//        chen.id = 1;
//        chen.name = "chengongsuo";
//        chen.password = "123456";

        List<User> list = new ArrayList<User>();
//        list.add(new User(1, "chengongsuo", "123456"));
//        list.add(new User(2, "zhen", "123456"));
//        list.add(new User(3, "John", "123456"));
//        list.add(new User(4, "Bob", "123456"));

        //3 + 1
        Connection connection = null;
        Statement statement = null;
        ResultSet resultSet = null;

        String sql = "select * from t_users";

        Class.forName("com.mysql.jdbc.Driver");

        connection = DriverManager.getConnection(
            "jdbc:mysql://localhost:3306/sctu_javaweb_2018?serverTimezone=UTC\n",
            "root",
            "123456"
    );

        statement = connection.createStatement();

        resultSet = statement.executeQuery(sql);

        while (resultSet.next()){
            int id = resultSet.getInt(1);
            String usrname = resultSet.getString(2);
            String password = resultSet.getString(3);
            //面向对象三个特征：封装、继承、多态
            User user = new User(id,usrname,password);
            list.add(user);

        }
        resultSet.close();
        statement.close();
        connection.close();



        for (User user : list) {
            out.write("<tr>\n" +
                    "          <td>" + user.id + "</td>\n" +
                    "          <td>" + user.name + "</td>\n" +
                    "          <td>" + user.password + "</td>\n" +
                    "          <td><a href=\"userAdd.jsp\">添加<a></td>\n" +
                    "          <td><a href='userUpdate.jsp? id = "+user.id+"username = "+user.name+" password = "+user.password+" '>更新<a></td>\n" +
                    "          <td><a href='userDelect.jsp? id = "+user.id+ "'>删除</a></td>\n" +

                    "        </tr>");

        }
        for (int i = 0; i < 10; i++) {
            //alt + shift + 向上箭头
            //ctrl + alt + l格式化
//            out.write("<tr>\n" +
//                    "          <td>"+i+"</td>\n" +
//                    "          <td>Jhon</td>\n" +
//                    "          <td>123</td>\n" +
//                    "        </tr>");
        }

    %>
</table>
    </tbody>

    <tfoot>


    </tfoot>
</table>

<%--
    JSP指令
    page
    include
    taglib

    JSP动作元素
    jsp:include
    jsp:param
--%>
<%--    静态信息--%>
<%--<%@ include file="footer.jsp"%>--%>

<%--  JSP前缀 动态信息--%>
<jsp:include page="footer.jsp">
    <jsp:param name="year" value="2018"/>
</jsp:include>




<%--如何让只有登录的的人才能看到用户列表，未登录的人跳转到登录界面
    session
    空间 你可以定义变量
--%>

</body>
</html>
